Moving in with a partner who owns the house: what to agree about money and rent

Moving in with a partner who owns the house: where do you both start?

Moving in with a partner who owns the house is one of the most common ways couples end up living together. It also raises a question many couples never quite ask out loud: what is the money the new partner pays each month actually for?

The law in England and Wales starts simply. If the home is in one partner’s name, the starting point is that they own all of it. Moving in doesn’t change that, however long you live together, because there’s no such thing as common-law marriage. Fewer than half of the people we surveyed (18 of 39) knew that living together doesn’t give you the same rights as marriage.

Paying towards the home doesn’t automatically change it either. A share usually only arises if you both intended one, and that is worked out from what you each said and did. Our guide to when your partner owns the house and you’re not on the deeds explains the legal side in full. This guide is the practical companion: what to agree about rent, bills and the mortgage, and how to write it down.

Both of you have a fair point to make:

• The partner who owns the home took on the deposit, the mortgage and the risk, and pays for repairs and insurance. It’s reasonable to want the home to stay theirs unless you both decide otherwise.
• The partner moving in would pay rent anywhere else, so paying something is fair. But if they pay half the mortgage for years, it’s reasonable to ask whether any of that is building something for them.

Neither view is wrong. The aim is to choose one arrangement together, before the payments start.

Should you pay rent to a partner who owns the house?

There’s no rule that says you must, or mustn’t. Advicenow’s guide to living together agreements describes the choice clearly. If the owner doesn’t want to share the home, the partner moving in could pay only towards general living expenses, or could pay towards the home and treat it as the rent they’d otherwise pay somewhere else. Whatever you choose, Advicenow says to spell it out in your agreement.

In practice, couples tend to pick one of three arrangements:

Arrangement	What the money is for	Share of the home?
Contribution to costs	Half the mortgage, bills or both	No
Rent-like payment	A set monthly amount for living there	No
Building a share	Paying towards the mortgage in return for a share	Yes, if recorded

A contribution to costs moves with the bills: if the mortgage rate rises, so does the payment. A rent-like payment is a fixed sum you review now and then, and the owner covers the ownership costs, such as rate rises and repairs. Building a share means the payments, or part of them, earn the partner moving in an interest in the home, which you record in a declaration of trust.

Shelter’s legal guidance says a partner who doesn’t own the home usually lives there with the owner’s permission, and the owner only has to give reasonable notice. That’s one more reason to agree a notice period between you.

Does paying towards the mortgage give you a share?

Not automatically. Advicenow says mortgage repayments, and paying for repairs, renovation and refurbishment, can help show you’ve gained a share. But it also says this is usually very tricky to prove, and the question a court asks is what you both intended. Where a home is in one name, the Supreme Court has said there’s no presumption that you share it.

Three points are worth knowing:

• Bills aren’t on the list. Paying towards household bills isn’t on Advicenow’s list of contributions that can show a share.
• The intention has to be about the home. In Geary v Rankine, the Court of Appeal said an intention to run a business together didn’t show an intention to own the building together.
• A mortgage payment isn’t all ownership. On a repayment mortgage, part of each monthly payment is interest to the lender, and only part reduces the loan. So paying half of a £900 payment doesn’t buy half of anything. It’s closer to sharing what the owner pays to borrow, plus a slice of the loan.

If you both want the payments to build a share, a declaration of trust is the clearest way to record it. Under the Law of Property Act 1925, a declaration of trust over land must be shown in writing signed by the owner. HM Land Registry’s guidance says the owner must then apply for a note on the title called a Form A restriction, and the other partner can apply for it too. A solicitor can prepare both.

What could £450 a month mean over three years?

This is an illustration with made-up numbers, not a forecast or a legal entitlement. Sam owns a flat in their name, with a mortgage payment of £900 a month. Jordan moves in and pays £450 a month. Sam pays the other £450, plus insurance, repairs and the service charge.

Over three years, Jordan pays £450 × 36 months = £16,200. Sam pays the same towards the mortgage. To keep the numbers simple, say £300 of each £900 payment reduces the loan and £600 is interest. Over 36 months, that knocks £10,800 off the mortgage. Half of that, Jordan’s half, is £5,400.

What Jordan's £450 a month means after three years, depending on what Sam and Jordan agreed

What they agreed	Jordan paid	What Jordan has at the end
Contribution to costs	£16,200	No share
Builds a share (declaration of trust)	£16,200	£5,400 back first
Rent-like payment	£16,200	No share

Contribution to costs. Jordan’s £450 is their half of the mortgage. If the rate rises and the payment goes to £1,000, Jordan pays £500. Jordan has had a home for three years, and Sam’s flat stays Sam’s. This is close to what many couples assume, so the key is to say it out loud.

Builds a share. Sam and Jordan sign a declaration of trust saying that if the flat is sold, or they split, Jordan gets back their half of what the loan went down while they paid: £5,400 after three years, if there’s enough from a sale. Sam keeps the rest, including any rise in value. They could choose a different formula, such as a percentage share, but this one is simple and easy to track.

Rent-like payment. Jordan pays a set £450 for living there, reviewed once a year. If the mortgage rate rises, Sam carries it. If the boiler breaks, Sam pays. Jordan has no share, and in return has a fixed cost and an agreed notice period, like renting.

Jordan pays the same £16,200 in every row. What changes is what that money means. None of the three is the “right” answer. A partner who’d otherwise rent might be happy with the third row; a couple planning a long future together might prefer the second.

Illustration only: on a real repayment mortgage, the part that pays off the loan usually grows each year, and this ignores selling costs, tax and changes in value. If you later buy somewhere together, the deposit split calculator shows how different splits work out.

What else changes when a partner moves in?

A few practical things change on the day you move in, whichever arrangement you choose.

• Council tax. In England and Wales, the bill is cut by 25% if only one adult lives in the home. When a partner moves in, that discount usually ends. GOV.UK says partners who live together are jointly responsible for the bill, and that if you get a discount by mistake, you must tell the council or you could be fined.
• Benefits. If either of you claims Universal Credit, GOV.UK says couples who live together must make a joint claim, and the amount depends on both your incomes and savings. Moving in with a partner is a change you must report. GOV.UK says not reporting a change can lead to a penalty or having to repay money.
• Tax on rent. GOV.UK’s Rent a Room scheme lets you earn up to £7,500 a year tax-free from letting furnished accommodation in your own home. If you set up a formal rent arrangement, or the sums are large, ask HMRC or an accountant how tax applies to you.
• The mortgage. The mortgage stays in the owner’s name. Shelter’s legal guidance says the person named on the mortgage is the only one liable for the payments, whatever the other partner contributes. If you’re thinking of a formal rent or lodger arrangement, the owner should check the mortgage terms and ask the lender if unsure.
• Insurance. Tell your home insurer someone has moved in, and check whether the partner’s belongings are covered.

What should you agree, and write down?

Whichever arrangement you choose, a short written couples agreement (also called a cohabitation agreement) saves guessing later. Advicenow says a court will usually follow a living together agreement if what you agreed is fair and you were both honest about your finances, and it’s even more likely to if you each had independent legal advice. Courts can take it into account; see how your agreement counts.

Cover these points:

1. What the monthly payment is for. Contribution to costs, rent-like, or building a share. Name it.
2. How much, and when it’s reviewed. A fixed sum, a share of the mortgage, or a share of all costs, and when you’ll look at it again.
3. Bills and everyday costs. Who pays council tax, energy, broadband and food, and in what split.
4. Big one-offs. If the partner moving in pays towards a new kitchen or paying off part of the mortgage, is it a gift, does it come back first, or does it buy a share? Our partner owns the house guide walks through a £10,000 example.
5. Notice to move out. How long the partner moving in gets if you split up, such as two or three months, and who pays what in that time.
6. What happens if you split. Whether anything comes back to the partner moving in, and how it’s worked out.
7. If you marry or buy together later. Whether the agreement ends, or carries over.
8. Wills. Citizens Advice says an unmarried partner won’t automatically inherit anything if the other dies without a will, so if the owner wants their partner to be able to stay, or to get something back, they should make one.

If you choose to build a share, add a declaration of trust to the agreement. If you’d rather both be owners, being added to the title is the other route; our guide to what a couples agreement covers explains how the pieces fit together.

What should you do next?

1. Talk before the first payment. It’s far easier to agree what the money is for now than to work it out years later.
2. Have the conversation side by side. The free 10-minute conversation covers homes where one of you owns, including the mortgage, bills and big one-offs. Your answers stay on your device.
3. Pick an arrangement. Contribution to costs, rent-like or building a share. Run your own numbers like Sam and Jordan’s.
4. Write it down. Put it in a couples agreement you both sign, and keep a record of payments.
5. Record any share. If the payments are meant to build a share, ask a solicitor about a declaration of trust and the Form A restriction.
6. Sort the practical bits. Tell the council, the benefits service if either of you claims, and the home insurer. Check the mortgage terms.
7. Make wills, especially the owner.
8. Get separate legal advice if large sums are involved, there are children from a previous relationship, either of you feels under pressure, or you’re separating now.

For the wider picture, read what rights unmarried couples have.